function singmatch() {
    this.work = function work(la) {
        var d = 0;
        var win = null;
        for ( i in la) {
            var d1 = la[i].sing();
            if (d1 > d) {
                d = d1;
                win = la[i];
            }
        }
        return "winner is " + win.name;
    }

  
}